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High-calcium-oxide-content calcium oxide material and preparation method thereof

A high calcium oxide and calcium oxide technology, applied in the field of calcium oxide materials, can solve the problems of high preparation cost, cumbersome methods and the like, and achieve the effects of high use temperature, simple process and stable high temperature performance.

Inactive Publication Date: 2017-05-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] It can be seen that the existing methods for preparing calcium oxide materials are relatively cumbersome, require high-temperature firing, and the cost of preparation is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A calcium oxide material with high calcium oxide content and a preparation method thereof. Take 50~70wt% calcium oxide particles and 30~50wt% calcium oxide fine powder as raw materials, plus 2~3wt% anhydrous phenolic resin of the raw materials, stir for 2~8 minutes, press and shape, and then at 180~220℃ Heat treatment for 8-12 hours and cool naturally to obtain calcium oxide material with high calcium oxide content.

[0031] The preparation method of the calcium oxide particles is as follows: first, the mass ratio of calcium hydroxide fine powder: additive is 1: (0.002~0.02) ingredients, wet grinding for 1 to 5 hours, filtering, drying, and grinding to a particle size of 1 ~300μm to obtain a mixed powder; then put the mixed powder in the bucket of the granulation equipment, and add 8-30wt% of the mixed powder to the bucket under the condition of 1000-3000 revolutions per minute Water, when particles begin to form, adjust the speed to 500~1000 revolutions per minute, and s...

Embodiment 2

[0035] A calcium oxide material with high calcium oxide content and a preparation method thereof. Take 40~50wt% calcium oxide particles and 50~60wt% calcium oxide fine powder as raw materials, plus 3~5wt% anhydrous phenolic resin of the raw materials, stir for 8~14 minutes, press and shape, and then at 220~250℃ Heat treatment for 12 to 18 hours and cool naturally to obtain calcium oxide material with high calcium oxide content.

[0036] The preparation method of the calcium oxide particles is the same as in Example 1.

[0037] The additive is zirconia powder.

[0038] The calcium oxide material with high calcium oxide content prepared in this example has been tested: CaO content is 96.1-96.6wt%, compressive strength is 34.8-39.5MPa, and bulk density is 2.99-3.10g / cm 3 ; Keep at 50℃ and 90% humidity for 10h, dry at 110℃, the hydration weight gain rate of calcium oxide raw material body is 1.1~1.3%.

Embodiment 3

[0040] A calcium oxide material with high calcium oxide content and a preparation method thereof. Take 30~40wt% calcium oxide particles and 60~70wt% calcium oxide fine powder as raw materials, plus 5~6wt% anhydrous phenolic resin of the raw materials, stir for 14~20 minutes, press and shape, and then at 250~300℃ Heat treatment for 18-24 hours and cool naturally to obtain calcium oxide material with high calcium oxide content.

[0041] The preparation method of the calcium oxide particles is the same as in Example 1.

[0042] The additive is yttrium oxide powder.

[0043] The calcium oxide material with high calcium oxide content prepared in this example has been tested: CaO content is 96.4~97wt%, compressive strength is 38.5~45MPa, and bulk density is 3.05~3.12g / cm 3 ; Keep for 10h under the conditions of 50℃ and 90% humidity, and dry at 110℃, the hydration weight gain rate of calcium oxide raw material body is 0.95~1.2%.

[0044] Compared with the prior art, this specific implement...

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Abstract

The invention relates to a high-calcium-oxide-content calcium oxide material and a preparation method thereof. The technical scheme of the preparation method is that 30wt% to 70wt% of calcium oxide particle and 30wt% to 70wt% of calcium oxide fine powder are used as raw materials, anhydrous phenolic resin which is 2wt% to 6wt% of the raw materials is additionally added, and an obtained mixture is agitated for 2 to 20 minutes, is subjected to compression molding, then is subjected to heat treatment for 8 to 24 hours in a condition of 180 to 300 DEG C, and is naturally cooled, so that the high-calcium-oxide-content calcium oxide material is obtained. The preparation method is simple in process; the prepared high-calcium-oxide-content calcium oxide material is high in usage temperature, stable in high-temperature performance and good in anti-hydration performance, can be used for purifying a high-temperature fused mass, and is suitably used as a high-temperature material for smelting a high-purity fused mass.

Description

Technical field [0001] The invention belongs to the technical field of calcium oxide materials. In particular, it relates to a calcium oxide material with high calcium oxide content and a preparation method thereof. Background technique [0002] Calcium oxide material is a special refractory material made of calcium oxide (calcite) as the main mineral (CaO as the main component). The true density of calcite (CaO) is 3.75g / cm3, the melting point is 2570℃, the Mohs hardness is 6 degrees, the average linear expansion coefficient is 13.8×10-6 / ℃, and the thermal conductivity is 1000℃. It is 7.71 W / (m·K), the resistivity at 930°C is 4.175×106Ω·cm, and the resistivity at 1460°C is 91Ω·cm. It is an alkaline refractory material. Although calcium oxide products have the advantages of good high temperature performance and strong resistance to alkaline slag erosion, they are very easy to react with water or moisture. Therefore, calcium oxide clinker and calcium oxide products are extremely...

Claims

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Application Information

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IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3208C04B2235/3244C04B2235/5427C04B2235/5436
Inventor 魏耀武岳瑞张涛韩兵强李楠
Owner WUHAN UNIV OF SCI & TECH
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